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Bituminous mixture proportion design method based on tightest state

A mix ratio design, asphalt mixture technology, applied in the field of asphalt mixture ratio design, to achieve the effect of saving asphalt resources, simple design parameters, reasonable asphalt ratio

Inactive Publication Date: 2010-06-23
交通部公路科学研究院
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Problems solved by technology

There is still a certain blindness in the determination of the mixture asphalt ratio.

Method used

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  • Bituminous mixture proportion design method based on tightest state
  • Bituminous mixture proportion design method based on tightest state
  • Bituminous mixture proportion design method based on tightest state

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with specific examples, and the following examples are only used to illustrate the present invention rather than limit the present invention.

[0034] According to the method for designing the proportion of asphalt mixture based on the most compact state of the present invention, its design process specification is as follows:

[0035] 1. Determine the range of the best asphalt-stone ratio covering the gradation based on experience, generally set 5-6 asphalt-stone ratios at intervals of 0.3-0.4% for testing, and the sample size of parallel test pieces under each asphalt-stone ratio is generally not less than 4 indivual.

[0036] 2. Weigh the required stones according to the proportion of stones, and make preparations before forming the test pieces according to the current standard "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering". Molding is carried out according to the select...

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Abstract

The invention proposes a bituminous mixture proportion design method based on tightest state. The method includes that: (1) three parameters for evaluating the tightness of mixture mineral aggregate are determined, including the voidage of mineral aggregate , the voidage of coarse mineral aggregate and the mixture mineral aggregate dry density; (2) the relevance of the three parameters are demonstrated, the secondary curvature model is adopted for analysis to determine the extreme values of the corresponding parameter curvatures as the tightest state of the mixture; (3) the oilstone ratios corresponding to the extreme values of the parameters are selected, namely the oilstone ratios corresponding to the maximums of the voidage of mineral aggregate VMA and the voidage of coarse mineral aggregate VCA, and the oilstone ratio corresponding to the maximum of mineral aggregate dry density, and the oilstone ratios correspond to the tightest state of the mixture; (4) for reducing error, the average value of the three oilstone ratios is used as the design oilstone ratio. The invention is applicable to coarse aggregate gap-graded bituminous mixture and ensures the bituminous mixture designed by the invention to have good road performance.

Description

technical field [0001] The invention relates to a design method of asphalt mixture ratio, in particular to a design method of asphalt mixture ratio based on the most compact state, and belongs to the technical fields of highway and urban road discipline, asphalt pavement specialty, and asphalt concrete design. Background technique [0002] The core of asphalt mix ratio design is to determine the asphalt ratio (or asphalt dosage) in a certain state of optimal performance for a fixed mineral material gradation. [0003] The current international and domestic relevant regulations generally use 5 parameters (stability, flow value, void ratio, bulk density, saturation) or 4 parameters to determine the asphalt ratio of the mixture. This method considers too many factors, which leads to The engineering significance is not clear, and the actual engineering shows that, especially for heavy-duty traffic and coarse aggregate discontinuously graded mixtures, the mixture-asphalt ratio de...

Claims

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Application Information

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IPC IPC(8): C04B26/26
Inventor 王旭东张蕾李美江周兴业
Owner 交通部公路科学研究院
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